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Embodied carbon in construction is the greenhouse-gas impact of the materials and related processes used to create, maintain, repair, replace and dispose of a built asset. To measure it, define the asset and life-cycle boundary, quantify the included materials and activities, pair those quantities with appropriate emissions data, and report the modules, units, period and assumptions. Without that scope, a carbon total is hard to interpret—and often impossible to compare fairly.
This guide explains the life-cycle stages, a practical assessment workflow, how to use Environmental Product Declarations (EPDs), and what to check when comparing materials or design options. It applies to building and infrastructure assessments generally; the exact requirements depend on the method and jurisdiction selected.
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What is embodied carbon in construction?
Embodied carbon is the greenhouse-gas emissions and removals associated with a built asset’s materials and related processes across a defined part of its life cycle. It is not the physical carbon content of a building. In this context, “carbon” generally means greenhouse gases expressed as carbon-dioxide equivalents (CO2e), rather than carbon dioxide alone. The result depends on what is assessed, which life-cycle stages are included, and what data and assumptions are used.
For example, one assessment might report only product manufacturing and construction, while another follows materials through maintenance, replacement and end of life. Both may be described as embodied-carbon assessments, but their totals are not directly comparable unless their scopes and methods are aligned. The NSW technical guide and a peer-reviewed review of embodied-carbon assessment explain the importance of defining the assessment boundary.
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Operational carbon is generally reported separately. It includes operational energy and water impacts, while whole-life carbon brings embodied, operational and other relevant carbon categories together under the chosen method. The Royal Institution of Chartered Surveyors (RICS) defines the broader concept this way: “Whole life carbon refers to the carbon impacts over the entire life cycle of a built asset, from its construction through to its end of life.” — RICS, Whole life carbon assessment for the built environment, second edition (2023).
The distinction matters because a project can reduce one category while affecting another. A material or design decision should therefore be judged against the project’s stated assessment objective, not by treating one partial carbon figure as a complete account of the asset’s impact.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchWhich life-cycle modules should an assessment include?
Life-cycle modules identify which stages are counted. State the standard or method used and list the modules included; a label such as “embodied carbon” alone does not tell a reader what the number covers.
| Module | What it covers | How to interpret it |
|---|---|---|
| A1–A3 | Product stage: raw-material supply, transport to manufacturing and manufacture. | Often called product-stage or cradle-to-gate impacts. |
| A4–A5 | Transport to the site and construction or installation processes. | Commonly included with A1–A3 in upfront-carbon totals. |
| B1–B5 | Material-related in-use impacts, including use, maintenance, repair, replacement and refurbishment. | These stages can make service life and replacement assumptions important. |
| B6–B7 | Operational energy and water. | Generally distinguished from embodied carbon in reporting conventions. |
| B8 | User or enabled emissions, such as activities enabled by an asset. | Not the same as the material-related in-use stages. |
| C1–C4 | Deconstruction or demolition, transport, waste processing and disposal at end of life. | Include when the chosen boundary covers end-of-life impacts. |
| D | Potential benefits and loads beyond the assessed system boundary. | Where the method calls for it, report separately rather than silently netting it against A–C. |
The NSW 2025 guide focuses its detailed upfront measurement on A1–A5 and gives higher-level guidance for B1–B5 and C1–C4. It excludes B6–B8 and D from its embodied-carbon focus. That is the scope of that guide, not a universal rule that every project should omit those modules. The RICS whole-life carbon standard provides a broader assessment framework.
When someone gives you a carbon total, ask whether it is A1–A3, A1–A5, A–C, or another boundary. Ask as well whether operational energy and water, enabled emissions and module D are excluded, included separately, or treated another way. Those distinctions can explain why two apparently similar totals differ.
How do you calculate embodied carbon in a building?
At its simplest, a project assessment combines quantities of materials and activities with corresponding life-cycle emissions data. The calculation is only as defensible as its inventory, data choices and declared boundary. A reliable workflow makes those choices visible and revisits the estimate as the design becomes more detailed.
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- Define the assessment. Identify the asset, components or project being assessed, the purpose of the calculation, the reporting period, the life-cycle boundary and the modules to include. Record the method or standard you will follow.
- Collect project information. Gather the available design, specification, quantity and construction information. Identify relevant energy sources and other activities required by the selected scope. Record what is known and what is still an assumption.
- Build a components and materials inventory. List the included components and quantify them using units that can be matched to the environmental data. Make exclusions explicit. An inventory is not complete merely because the major structural materials are present.
- Match quantities with emissions data. Use suitable product-specific EPDs where available. If you need generic data, record the dataset and why it is appropriate. Check that the unit and modules in the data correspond to the quantity and stages in your assessment.
- Assess construction and later life-cycle stages. Account for the in-scope transport, installation, use, maintenance, repair, replacement, refurbishment and end-of-life activities. Use the stages required by the method and state which ones remain outside the boundary.
- Handle beyond-boundary effects separately. If the selected method includes potential benefits or loads beyond the system boundary, such as module D, identify and report them separately where required. Do not quietly subtract them from A–C and present only a net figure.
- Document and report. State the object assessed, boundary, modules, units, reference period, data sources, exclusions and assumptions alongside the result. This gives readers a way to understand what the total represents.
- Update as the design evolves. Recalculate at project phases as quantities, specifications and procurement information become more specific. Identify what changed between estimates rather than presenting each new total without context.
This sequence reflects the high-level workflow in the RICS method: initiate the assessment and set its scope and boundaries; collate project information; build the components inventory and identify energy sources; assess emissions to completion; assess post-completion emissions over the reference study period; assess potential benefits and loads beyond the boundary; and compile a report. RICS recommends repeating the assessment as the project develops.
A simple calculation structure
For an inventory item, the basic relationship is:
Item impact = quantity of the item × emissions factor for the matching unit and life-cycle modules.
The project total is the sum of the impacts for all included items and activities under the declared boundary. This is a calculation structure, not a shortcut around method selection: the quantity, emissions factor, units and module coverage must actually match. If a product’s data cover A1–A3 but the assessment reports A1–A5, the missing in-scope stages cannot be assumed to be represented by that product-stage value.
For example, a project team could record the specified quantity of a component, select an EPD whose declared unit matches that quantity, and apply only the modules relevant to the reported total. If the team instead uses a generic dataset, it should identify that dataset and document why it suits the product, place and period being assessed. No single number should be detached from these choices and treated as a material’s universal carbon value.
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What is the difference between an EPD and a generic dataset?
An Environmental Product Declaration is an independently verified environmental declaration for a product or service, prepared under relevant rules and reporting requirements. It can provide product life-cycle data for an assessment. A generic dataset supplies representative data rather than a declaration for the exact product being considered; it may be necessary when suitable product-specific information is unavailable.
An EPD does not automatically make two products comparable or prove that one is lower-carbon. Before using or comparing declarations, check:
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- Declared or functional unit: Does the unit match the quantity you are calculating, and does it represent equivalent service when the comparison requires that?
- Product category rules: Were the products assessed under compatible rules?
- Geography: Is the manufacturing or data context relevant to the project’s location?
- Date: Is the information current enough for the assessment? Manufacturing energy mixes and processes can change over time.
- Included modules: Do the declarations cover the same life-cycle stages required for the comparison?
- Performance and function: Do the products serve the same function or meet equivalent performance needs?
These checks apply to generic data too: its geographic, temporal and methodological relevance should suit the project, and its limitations should be recorded. The NSW guide and the peer-reviewed review both emphasize the role of appropriate data and transparent assumptions. Product-specific information may differ from generic or older data, so an early estimate should be refined as design and procurement information improves.
How can you compare the embodied carbon of building materials?
Compare materials only after aligning the function they perform, the unit of comparison and the assessment boundary. A lower figure per unit of product is not necessarily a lower impact for equivalent building service over the asset’s life.
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Use this comparison checklist:
- Match the function. Compare products that perform equivalent roles and meet the relevant performance needs. If service over time matters, the comparison may need a functional unit that describes that service.
- Align the reference unit. Confirm whether each figure refers to a declared unit or functional unit, and whether the units can be compared directly.
- Align modules and boundaries. Do not compare an A1–A3 figure with an A1–A5 or A–C figure as if they were the same scope.
- Align the assessment period. For a whole-life comparison, consider the reference study period and the implications of maintenance and replacement schedules.
- Review data quality and relevance. Check whether inputs are product-specific or generic, independently verified where applicable, geographically relevant and sufficiently current.
- Check the model is complete enough for the decision. Confirm that relevant components and building systems have not been omitted. The peer-reviewed review notes that excluding services such as heating, ventilation and air-conditioning can affect totals, particularly in technology-intensive buildings.
- Keep assumptions visible. Replacement schedules and end-of-life assumptions can change results. Record them rather than implying that the result is independent of those choices.
Methodological differences explain a substantial share of the range in published building values, according to the review in Buildings & Cities. Its recommendations include making the assessment object, included components, life-cycle stages and boundaries explicit. The practical lesson is to compare like with like first; if boundaries cannot be aligned, disclose the difference and avoid a simple ranking.
When should a project team measure embodied carbon?
Measure early enough for the result to inform design choices, then update it as the design and procurement information become more precise. RICS recommends repeating the assessment at project phases rather than treating one early estimate as a final answer.
At an early stage, quantities and product choices may be uncertain, so generic data and recorded assumptions may be necessary. This can still help identify where further information or design attention is needed, but the estimate should be presented as an estimate with its limitations. As specifications and procurement choices firm up, replace assumptions with more specific quantities and suitable product data where available.
Keep the scope consistent when comparing updates, or clearly explain what changed. If the asset boundary, included components, modules, reference period or data quality changes between versions, a difference in totals may reflect the assessment rather than a design improvement or deterioration. A transparent update log can identify changes in quantities, data sources, specifications and assumptions.
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Which tools and guidance can help?
Tools vary in scale, data coverage, life-cycle modules, geography and price. The U.S. Department of Energy’s 2024 reference guide groups tools into design-integrated whole-building life-cycle assessment tools and standalone material or whole-building LCA tools. An early-stage calculator is not interchangeable with a full assessment: choose a tool that can support the object, modules, data and reporting requirements you have defined.
Building Transparency describes EC3 as a free, open-access tool and EPD database for comparing building materials using supply-chain-specific EPDs and for planning or comparing project embodied-carbon impacts. That makes it relevant to product selection and procurement. It should not be represented as a substitute for a complete whole-building assessment unless it meets that assessment’s requirements. See Building Transparency’s tool information.
The RICS standard lists EC3 and a range of generic and commercial life-cycle assessment data sources. Tool capabilities and terms can change, so confirm current coverage, data sources, geographic fit and licensing directly with the relevant provider before relying on a tool for a project deliverable. Software does not remove the need to state scope, check inputs or document assumptions.
Jurisdiction matters. RICS’s current standard page says the second edition took full effect for RICS members on 1 July 2024 and relates the methodology to ICMS 3. It also notes that the Built Environment Carbon Database is currently UK-only. Do not assume that a UK-specific dataset or reporting context automatically represents another region. The NSW guide is government guidance for New South Wales infrastructure, not a universal requirement for all construction projects.
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Why does embodied carbon matter?
Embodied-carbon measurement gives project teams a way to see the material and process impacts that are not captured by operational-energy figures alone. Its value depends on decisions being made with a clear view of the scope and trade-offs, rather than relying on an isolated total.
As a historical global reference—not a current estimate or a project benchmark—UNEP estimated embodied carbon at about 12% and operational carbon at approximately 28% of global CO2 emissions in 2021, as reported by RICS in its 2023 standard. These figures describe a global estimate for that year. They should not be applied as a predicted share for an individual building, jurisdiction or current year.
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For a project, the more useful question is not whether its carbon total matches a global percentage. It is whether the assessment includes the right asset and components, uses a stated and relevant boundary, pairs quantities with suitable data, and presents results in a way that supports a fair decision.
What should a defensible embodied-carbon report disclose?
A result is more useful when another person can understand what was counted and why. At minimum, report the following alongside the total:
- the asset, project scope and components assessed;
- the assessment method or standard and its jurisdictional context;
- the life-cycle boundary and each module included or excluded;
- the reference study period and units used;
- the sources of product-specific, generic or other life-cycle data;
- the assumptions for quantities, transport, construction, maintenance, replacement and end of life, as relevant to the scope;
- known data limitations and material exclusions; and
- whether potential beyond-boundary benefits or loads are reported separately.
This information makes it possible to interpret the number, update it, and judge whether it is suitable for the decision at hand. It also prevents a partial estimate from being mistaken for a complete whole-life result.
Frequently Asked Questions
Does an embodied-carbon assessment certify that a building meets a regulation?
Not by itself. An assessment calculates and reports impacts under a chosen method; whether that work meets a legal, planning, client or certification requirement depends on the applicable rules and the required scope in the project’s jurisdiction.
Can I use the same embodied-carbon result for a different project?
Only with care. A result depends on the assessed asset, quantities, data, geographic and time context, life-cycle boundary and assumptions, so it should not be transferred as a universal value for another project.
What should I do if two EPDs use different units or product category rules?
Do not rank their figures directly. First establish whether a valid conversion and a functionally equivalent comparison are possible under the relevant assessment method; if not, use another suitable data source or disclose that the comparison is not like-for-like.
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The life-cycle concept also covers maintenance, repair, replacement and end-of-life impacts for built assets. The assessment boundary and the treatment of existing materials or work still need to be defined for the specific project.
